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This paper examines the relationship between tax avoidance and accounting comparability. The authors argue that aggressive tax behavior impairs the comparability of financial statements by altering the accounting function, which maps economic events into accounting data.

The empirical analysis is based on a large sample of United States (US) firms. The authors use raw and industry-adjusted effective tax rates (ETRs) to proxy tax avoidance. The authors use the measure of accounting comparability developed by De Franco et al. (2011), which aims to capture the similarity of the accounting function.

The authors find that firms with more aggressive tax avoidance strategies have substantially lower accounting comparability. The evidence also shows that the negative effect of tax avoidance on accounting comparability is driven by firms with aggressive tax planning strategies beyond the industry norm. Furthermore, using an alternative measure of accounting comparability as a function of pre-tax income, the authors continue to find evidence of the negative effect of tax avoidance behavior. Importantly, this provides evidence that the effect of aggressive tax planning is not limited to the reported tax expense, but affects the comparability of the overall financial reporting system.

The authors identify a new potential cost of tax aggressive activities, being the loss of accounting comparability as driven by tax aggressive activities. The results contribute to the literature on the costs of tax avoidance and on the determinants of accounting comparability.